$\frac{dy}{dx}=\frac{4}{x^2e^{3y+9}}$
$\lim_{x\to0}\left(\frac{tan^2\left(x-2\right)}{x^2-4}\right)$
$6.25l^2+5l+1$
$d^2y-y=0$
$4xy+12y$
$\sqrt{5x^2}$
$\cos\left(sin^{-1}x+cos^{-1}y\right)$
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